Hi,
I'm not going to be too open about the things we do for clients, but the best ways to deal with negative online reviews are:
1) firstly, bad reviews are an opportunity to improve your business
2) Respond Promptly and sympathise
3) Try and take the issue offline or into email (so it becomes private)
4) If you think the review is just someone trying to hurt your business, contact the review site
Those are a few tips, It would be great to talk to you personally to see if we could help you